We've had some pineapple express systems come through the PNW and they were unbelievable rain events. One completely flooded the apartment complex bottom units where I lived.

Good luck bay area folks, definitely take it seriously. If you're a home owner and have been putting off cleaning out gutters, drains, etc. absolutely get on it right now while you have some time. These unusual rain events will easily back up semi-clogged or poor flowing drainage systems.